Fan device capable of increasing air pressure and air supply

ABSTRACT

A fan device capable of increasing air pressure and air supply includes a frame, a first blade wheel, a second blade wheel and a guide flow part. The frame is a hollow casing to define a flow passage with a first air port and a second air port available for air passing through. The guide flow part is held with a support in the flow passage and a driving device is received in the support. The first blade wheel with first fan blades and the second blade wheel with second fan blades are disposed in the flow passage next to the support for being driven by the driving device. The number of the first fan blades is more than that of the second fan blades. Once the first and second fan wheels are in operation, air induced by the fan wheels is guided by the guide flow part and air pressure and air supply of the fan system are increased substantively due to number of the first fan blades being greater than that of the second fan blades.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a fan device and particularly to a fan device capable of increasing air pressure and air supply.

2. Brief Description of the Related Art

Currently, there are three types of fans available on the market, the axial flow fan, the centrifugal fan and the transverse flow fan. The most popularly used one is the axial flow fan. Comparing the axial flow fan and the centrifugal fan with specific speed (Ns), the axial flow fan is suitable of being used in case of Ns>3 and the centrifugal fan is suitable for being used in case of Ns<1.5. Normally, less Ns value means air resistance is greater, that is, the axial flow fan is hard to be designed to meet requirement of actual application and the centrifugal fan is incapable of offering sufficient air supply in spite of having sufficient air pressure.

The conventional cooling fan usually has a fan frame being supported with bar shaped structure, which is called rib sections. It is found that the rib sections create the air resistance after a delicate analysis of the rib sections vs. air pressure being conducted. Due to the fan rotating to perform work to the air, the air flow creates turbulence to constitute spiral air to result in air pressure loss and affect performance of the fan.

SUMMARY OF THE INVENTION

Accordingly, an object of the present invention is to provide a fan device capable of increasing air pressure and air supply in which a flow guide part with a plurality sets of fan wheels in different sizes are provided to increase the air pressure and the air supply.

another object of the present invention is to provide a fan device capable of increasing air pressure and air supply with which system resistance to the fan device is capable of being overcome effectively.

In order to achieve the preceding object, a fan device capable of increasing air pressure and air supply according to the present invention includes a frame, a first blade wheel, a second blade wheel and a guide flow part. The frame is a hollow casing to define a flow passage with a first air port and a second air port available for air passing through. The guide flow part is held with a support in the flow passage and a driving device is received in the support. The first blade wheel with first fan blades and the second blade wheel with second fan blades are disposed in the flow passage next to the support for being driven by the driving device. The number of the first fan blades is more than that of the second fan blades. Once the first and second fan wheels are in operation, air induced by the fan wheels is guided by the guide flow part and air pressure and air supply of the fan system are increased substantively due to number of the first fan blades being greater than that of the second fan blades.

BRIEF DESCRIPTION OF THE DRAWINGS

The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:

FIG. 1 is an exploded perspective view of a preferred embodiment of a fan device capable of increasing air pressure and air supply according to the present invention;

FIG. 2 is a sectional view of the fan device shown in FIG. 1;

FIG. 3 is an exploded perspective view similar to FIG. 1 illustrating an implemented impeller;

FIG. 4 is an exploded perspective view similar to FIG. 3 illustrating another implemented impeller; and

FIG. 5 is a sectional view similar to FIG. 2 illustrating the first air port having an inclining inner surface;

FIG. 6 is a sectional view similar to FIG. 5 illustrating the first air port having an outward curved inner surface;

FIG. 7 is a sectional view similar to FIG. 6 illustrating the first air port having an inward curved inner surface;

FIG. 8 is a sectional view similar to FIG. 2 illustrating the second air port having an inclining inner surface;

FIG. 9 is a sectional view similar to FIG. 8 illustrating the second air port having an outward curved inner surface;

FIG. 10 is a sectional view similar to FIG. 9 illustrating the second air port having an inward curved inner surface;

FIG. 11 is a sectional view similar to FIG. 8 illustrating the hubs of the fan wheels having an outward curved head respectively;

FIG. 12 is a sectional view similar to FIG. 11 illustrating the hubs of the fan wheels having an inward curved head with a tip respectively; and

FIG. 13 is a sectional view similar to FIG. 12 illustrating the hubs of the fan wheels having a cone head with a tip respectively.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1, and 2, the fan device capable of increasing air pressure and air supply according to the present invention includes a first blade wheel 11, a second blade wheel 11′ and a frame 12. The first blade wheel 11 and the second blade wheel 11′ each have a plurality of fan blades 111, 111′ being arranged radially. The frame 12 is a casing with a hollow space to define a flow passage P with a first air port M1 and a second air port M2 available for air passing through. The frame 12 provides a guide flow part 121, which is composed of a plurality of static blades, and a support 122 is joined to the guide flow part 121. The guide flow part 121 has a shape similar to the fan blades 111, 111′ respectively. The support 122 further receives a motor (not shown), which is the driving device of the first and second blade wheels 11, 11′, so that the fan blades 111, 111′ are capable of rotating and air flow induced by the fan blades 111, 111′ is guided with the guide flow part 121. In addition, the number of the fan blades 111 of the first blade wheel 11 can be made to be more than that of the fan blades 111′ of the second blade wheel 11′ and/or the first blade wheel 11 is designed to provide a size greater than the second blade wheel 11′ as shown in FIGS. 3 and 4. In this way, air pressure of the fan system and air supplied by the fan system can be increased effectively.

Referring to FIGS. 5 to 10, the flow passage P can be arranged to have one of the air ports M1, M2 being enlarged and/or the other one of the air ports M1, M2 being reduced. For instance, the first air port M1 is expanded and/or the second air port M2 is reduced. It can be seen in FIG. 5 that the flow passage P has the first air port M1 being slant and expanded and the second air port being slant and reduced. FIG. 8 shows the flow passage P has the second air port M2 being slant and reduced. FIG. 6 shows the first air port M1 being expanded with a curved surface and FIG. 7 shows the first air port M1 being expanded with a concave surface. FIG. 9 shows the second air port M2 being reduced and expanded with a curved surface and FIG. 10 shows the second air port M2 being reduced with a curved surface. Hence, the air flow passing through the flow passage P from the enlarged air port to the reduced air port is capable of increasing velocity and pressure of the air greatly. Hence, a heat generating object (not shown) can be arranged at the second air port M2 and the air with increased velocity and pressure is capable of removing heat from the heat generating object.

It can be implemented that the first fan wheel 11 and the second fan wheel 11′ can be disposed either near the first air port M1 or the second air port M2 depending on the size of the respective fan wheel and the number of the fan blades on the respective fan wheel. Further, the guide flow part 121 with the support 122 can be placed near either the first fan wheel 11 or the second fan wheel 11′ depending on the need instead of being disposed at the middle of the flow passage P.

Further, Referring to FIGS. 11, 12 and 13, it can be implemented that the hubs 112, 112′ of the fan wheels 11, 11′ can be provided with a round edge, a bevel shaped edge or a triangular edge to prevent from low pressure zone created next to the hubs so as to avoid undesirable back flow.

While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

1. A fan device capable of increasing air pressure and air supply comprising: a frame being a hollow casing to define a flow passage with a first air port and a second air port available for air passing through, having a guide flow part being held with a support, and a driving device being received in the support; a first blade wheel with a plurality of first fan blades and a second fan wheel with a plurality of second fan blades being disposed in the flow passage next to the support for being driven by the driving device and first fan blades being more than the second fan blades; whereby, once the first and second fan wheels are in operation, air induced by the fan wheels is guided by the guide flow part and air pressure and air supply are increased substantively due to number of the first fan blades being greater than that of the second fan blades such that heat from a heat generating object, which is disposed next to the first air port or the next to the second the second air port, is removed effectively.
 2. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the first blade wheel has a size greater that the second blade wheel.
 3. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the first air part is expended to provide an enlarged opening.
 4. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the second air part is converged to provide a reduced opening.
 5. The fan device capable of increasing air pressure and air supply as defined in claim 3, wherein the first air port with the enlarged opening has a slant shaped surface.
 6. The fan device capable of increasing air pressure and air supply as defined in claim 4, wherein the second air port with the reduced opening has a slant shaped surface.
 7. The fan device capable of increasing air pressure and air supply as defined in claim 3, the first air port with the enlarged opening has a concave outward curved surface.
 8. The fan device capable of increasing air pressure and air supply as defined in claim 3, wherein the first air port with the enlarged opening has a concave inward curved surface.
 9. The fan device capable of increasing air pressure and air supply as defined in claim 4, wherein the second air port with the reduced opening has a converging and then diverging shaped curved surface.
 10. The fan device capable of increasing air pressure and air supply as defined in claim 4, wherein the second air port with the reduced opening has a concave inward curved surface.
 11. The fan device capable of increasing air pressure and air supply as defined in claim 4, wherein the first blade wheel is disposed near the first air port.
 12. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the second blade wheel is disposed near the second air port.
 13. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the guide flow part has a plurality of static blades joined to the support.
 14. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the guide flow part with the support is disposed in the middle of the flow passage.
 15. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the guide flow part with the support is disposed near the first fan wheel.
 16. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the guide flow part with the support is disposed near the second fan wheel.
 17. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the first and the second fan wheels have a hub with a round end respectively.
 18. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the first and the second fan wheels have a hub with a triangular cone end respectively.
 19. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the first and the second fan wheels have a hub with a bevel shaped end respectively. 